package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @BelongsProject: sky-take-out
 * @BelongsPackage: com.sky.service.impl
 * @Author: zhouzhijie
 * @CreateTime: 2023-11-13  16:40
 * @Description:
 * @Version: 1.0
 */
@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * @description: 新增菜品和对应的口味
     * @author: zhouzhijie
     * @date: 2023/11/13 16:47
     * @param: [dishDTO]
     * @return:
     **/
    @Override
    @Transactional//开启事务注解，可能涉及多表
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入一条数据
        dishMapper.insert(dish);
        //获取insert语句生成的主键值
        Long id = dish.getId();
        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null && flavors.size()>0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(id);
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * @description: 菜品分页查询
     * @author: zhouzhijie
     * @date: 2023/11/15 9:13
     * @param: [dishPageQueryDTO]
     * @return: 
     **/
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * @description: 菜品批量删除
     * @author: zhouzhijie
     * @date: 2023/11/15 14:45
     * @param: [ids]
     * @return:
     **/
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能删除：是否在起售中
        for (Long id : ids) {
            //根据当前id查询菜品的信息
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品在起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能删除：是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getSetmealByDishId(ids);
        if (setmealIds != null && setmealIds.size() > 0){
            //当前菜品被套餐关联，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //批量删除当前菜品数据
        dishMapper.deleteBatchByIds(ids);

        //根据菜品ids批量删除口味数据
        dishFlavorMapper.deleteBatchByDishIds(ids);
    }

    /**
     * @description: 根据id查询菜品和对应的口味
     * @author: zhouzhijie
     * @date: 2023/11/15 17:18
     * @param: [id]
     * @return:
     **/
    @Override
    @Transactional
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        //将查询到的数据封装到Vo
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * @description: 修改菜品
     * @author: zhouzhijie
     * @date: 2023/11/16 18:00
     * @param: [dishDTO]
     * @return:
     **/
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        //因为更新需要修改时间和操作人，dishDTO没有这两项
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表数据
        dishMapper.update(dish);
        //删除口味表数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味表数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null && flavors.size()>0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * @description: 根据分类id查找在售菜品
     * @author: zhouzhijie
     * @date: 2023/11/17 9:04
     * @param: [categoryId]
     * @return:
     **/
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = new Dish();
        dish.setCategoryId(categoryId);
        dish.setStatus(StatusConstant.ENABLE);
        List<Dish> dishes = dishMapper.list(dish);
        return dishes;
    }

    /**
     * @description: 菜品起售、停售
     * @author: zhouzhijie
     * @date: 2023/11/17 10:22
     * @param: [status, id]
     * @return:
     **/
    @Override
    public void startOrStop(Integer status, Long id) {

        Dish dish = new Dish();
        dish.setId(id);
        dish.setStatus(status);
        dishMapper.update(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
